化工原理课程的教学改革与应用型人才培养

化工原理是一门与工程实践密切联系的工程基础课,对培养应用型化工人才起着举足轻重的作用。通过灵活多样的教学方式和不断进取的考试改革,可以培养学生的工程思维能力、独立学习能力和综合运用能力,教学中的严格要求有助于培养严谨、踏实的优良品质,而高素质的教师则是培养应用型人才的关键。     

函数f（x）=a/sin^n x＋b/cos^n x最小值猜想的推广

文[1]中猜想：f（x）=a/sin^n x＋b/cos^n x（0〈x〈π/2,a,b∈R^＋,n∈N＋），当且仅当x=arctan ^n＋2√a/b时，取最小值（a 2/n＋2＋b 2/n＋2）n＋2/2。笔者发现不但此猜想是正确的，而且还得到它的一个推广，下面给出推广及证明（初等证明）．     

砼井壁的应力和极限承载能力的有限元计算

本文选用了正交各向异性体的本构关系和适应于砼井壁特性的强度准则,编制了对砼井壁进行数值分析的非线性有限元程序。并采用此程序分别对砼井壁在承受均布荷载和非均布荷载条件下的应力分布和极限承载能力进行了计算分析,其计算结果与实验结果得到了良好的吻合。     

HPb59—1黄铜超塑性压缩的试验研究

本文研究了工业上用HP()59-1黄铜在L/D=1,压缩对数应变ε>0.7,600—700℃,卡头速度0.0035—1.75mm/s条件下,在10t万能试验机上呈现超塑性压缩的变形规律。本文还探讨了合金的组织状态、超塑性压缩时的润滑条件等对变形的影响。     

Mg+注入对GaN晶体辐射损伤的研究

在蓝宝石衬底上通过金属有机物化学气相沉积(metal-organic chemical vapor deposition,MOCVD)方法外延生长的GaN薄膜具有良好的结晶品质,xmin达到2.00%.结合卢瑟福背散射/沟道(Rutherford backscattering/channeling,RBS/C)和高分辨X射线衍射(high-resolution X-ray diffraction,HXRD)的实验测量,研究了不同剂量和不同角度Mg+注入GaN所造成的辐射损伤.实验结果表明,随注入剂量的增大,晶体的辐射损伤也增大,注入剂量在1×1015atom/cm2以下,xmix小于4.78%,1×1016atom/cm2是Mg+注入GaN的剂量阈值,超过这个阈值,结晶品质急剧变差,xmin达到29.5%;随机注入比沟道注入的辐射损伤大,且在一定范围内随注入角度的增大,损伤也增大,在4×1015atom/cm2剂量下偏离〈0001〉沟道0°,4°,6°,9°时的xmin(%)分别为6.28,8.46,10.06,10.85;经过700℃/10min+1050℃/20s两步退火和1000℃/30s高温快速退火后,晶体的辐射损伤都有一定程度的恢复,而且1000℃/30s高温快速退火的效果更好,晶体的辐射损伤可以得到更好的恢复.     

Homogenization of a stationary navier-stokes flow in porous medium with thin film

The article studies the homogenization of a stationary Navier-Stokes fluid in porous medium with thin film under Dirichlet boundary condition.At the end of the article,＂Darcy＇s law＂is rigorously derived from this model as the parameter ε tends to zero,which is independent of the coordinates towards the thickness.     

Dependence of third-order nonlinear susceptibility on strain induced piezoelectric field in In_xGa_(1-x)N/GaN quantum well

The third-order susceptibility of InxGa1-xN/GaN quantum well (QW) has been investigated by taking into account the strain-induced piezoelectric (PZ) field, and the effective-mass Schrodinger equation is solved numerically. It is shown that the third-order susceptibility for third harmonic generation (THG) of InxGa1-xN/GaN QW is related to indium content in QW and the intensity of the PZ field. Thecharacteristics of xTHG(3) (-3ω, ω, ω,ω ) as the function of the wavelength of incident beam, well width and indium content, have been analyzed.     

高职院校化工类专业实验实训教学研究与实践——提高高职学生容量分析技能训练教学效果的方法探索

EDTA分析方法是化学分析中常用的容量分析法之一。在高职院校实验实训教学中，如何让学生在深刻理解实验原理的基础上，牢牢掌握正确规范的操作要领、提高学生的实验能力、实际操作技能和科研素养，是实验实训教学改革的一个方向。在“碳酸钙含量测定”的实验实训教学中，按“以课堂基本理论知识教学为基础，利用现代化教学手段强化规范动作演示及训练，注重实际操作过程辅导”三者相结合的模块化技能操作训练方法是行之有效的。     

STUDIES ON RESPONSE CHARACTERISTICS OF DRUG ISE''''S (Ⅶ)——PERFORMANCE AND THEORETICAL TREATMENT OF MICROCELLS CONNECTED IN SERIES

A new type of MCCS (microcells connected in series) has been constructed and its performances investigated. It has been applied to the determination of streptomycin. The sensitivity and accuracy have been increased significantly. A theoretical model for the error of determination using the MCCS has been suggested and proved experimentally using the Monte Carlo method, and the error model proposed in Ref. [1] revised.     

Theoretical Design of Single-Polarization Single-Mode Microstructured Polymer Optical Fibres

Using the full-vector plane-wave expansion method, a kind of PMMA-based polarization-maintaining microstructured optical fibre （PM-mPOF） is theoretically studied. Dependence of the cutoff wavelengths of the two orthogonal polarization states （polarized along the two principal axes of PM-mPOF） on the structure parameters of the fibre is investigated in detail A single-polarization single-mode （SPSM） PM-mPOF working in the visible region is designed and optimized with the result of the maximum SPSM bandwidth of 140nm.